Koupaliště Kristýna

Czechia River 1 - Excellent

Kristýna is a bathing facility located in a flooded coal mine reservoir near Hrádek nad Nisou in the Czech Republic. The bathing area has a grass and sandy shore with a sandy bottom and a beach approximately 500 meters long. Water quality is classified as excellent based on microbiological indicators (enterococci and Escherichia coli). The reservoir has experienced occasional algae blooms and elevated phosphorus levels, particularly following a 2010 flood event that breached a protective embankment.

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Water

An artificial reservoir formed by a flooded coal mine (flooded between 1872 and 1972). Surface area: 0.127 km². Elevation: 238 meters above sea level. The reservoir has no surface inflow or outflow. Sandy bottom with depths varying across the reservoir.

Location

Kristýna, a.s., Žitavská 745, Hrádek nad Nisou. The bathing facility is located in the town of Hrádek nad Nisou. Parking and accommodation in a guesthouse, cottages, or camping are available.

Facilities

Accommodation in a guesthouse, cottages, or camping. Restaurant and food stalls. Toilets and showers. Sports facilities available.

Water Quality

Water quality classified as excellent based on enterococci and Escherichia coli parameters. Phosphorus limits were only rarely exceeded. Algae bloom risks were detected in 2004 and again in August 2010 (chlorophyll a: 23 µg/l), associated with reduced transparency (0.8 m) following a flood event. No bathing bans have been issued. Transparency typically measured above 1.0 m.

Risks

Algae blooms identified as a risk, particularly linked to nutrient inputs from swimmers, fish farming activities, and potentially outdated sanitary facilities on the shore. Phosphorus enrichment supports primary production and algae development. Fish farming practices contribute to eutrophication.